Internal-combustion engine



Jan. 21, 1930. I 1 .-v. HOSFORD, 1,744,310

INTERNAL COMBUSTION ENGINE Original File d Oct. 11. 1926 INVENTORZeonard Zlfibsbrd.

ATTORNEY Patented Jan. 21, 1931) PATENT OFFICE LEONARD V. HOSFORD, OFPORTLAND, OREGON INTERNAL-COMBUSTION ENGINE Application filed October11, 1926, Serial No. 141,010, and in Canada November 9, 1926. RenewedJune 10, 1929.

My invention has for its object to provide an improved construction ofstationary piston and piston rod connection with a moving piston of thesleeve type and it particularly has for its object to provide amodification of the construction disclosed in Letters Patent No.1,567,949, issued December 29, 1925. In that patent the air is drawninto the moving piston through the stationary 1'0 pistons head from thecrank ease around the cross head; my present invention provides means toeliminate the connection between the crank case and the interior of thestationary piston so that the air drawn into the moving piston throughthe head of the stationary piston can be taken from a chamber around theoutside of the stationary piston instead of from the crank case, and yetI am enabled to utilize a sliding cross head to overcome the sidethrusts and maintain the advantages of the construction forming thesubject matter of the patent aforesaid.

I accomplish the objects above indicated by providing the cross headwith a cylin- 5 drical skirt and horizontal. web to constitute a dam orcutoff, locating the horizontal web between the place where theconnecting rod and the cylinder cross pin have bearings in the crosshead.

In its more detailed nature the invention also resides in those novelfeatures of construction, combination and arrangement of parts, all ofwhich will be first fully described, then be specifically pointed out inthe appended claims, reference being had to the accompanying drawing, inwhich Figure 1 is a vertical longitudinal section of a portion of anengine embodying the invention.

Figure 2 is a horizontal section on the line 2-2 of Figure 1.

Figure 3 is a detail perspective View of the cross head.

Figures 1 and 5 are detail side elevations 5 taken at right angles toone another, showing the cross head.

Figure 6 is a detail vertical section on the line 66 of Figure 4:.

In the drawing, in which like numerals of reference indicate like partsin all the figures,

1 represents the crank casing, 2 the crank shaft, 3 the cylinder and ithe stationary piston which, in the present case as in the patentaforesaid, is provided with opposed longitudinal slots 5, through whichthe re eiprocating piston cross head pin 7 passes. The pin 7 is securedin suitable bearings in the reciprocating piston 6 which moves Withinthe cylinder and over and around the stationary piston. Y

The cross head in the present invention has opposed bearing slides 9united by a vertical web 10 which is provided with a cross head pinbearing lug 12 at the top and a cross head connecting rod pin bearing 14at the bottom. 5 Between the lug 12 and bearing 14 is a partition web 11which is provided with a skirt 16, the skirt and web 11 constituting apartition shell together with the adjacent parts of the bearing slides9.

13 is the connecting rod pin and 8 the connecting rod which joins withthe crank shaft.

The stationary piston is provided with suitable one-way valves 15 in itshead so that on the up stroke of that piston air will be drawn from theinterior of the stationary Jiston and through the slots 5 from thechamher 17 surrounding the stationary piston at the lower end of thecylinder 3, air being admitted to this chamber 17 through suitable portsprovided for the purpose.

The provision of the partition shell on the cross head serves to out offcommunication between the interior of the stationary piston and theinterior of the crank case.

From the foregoing description, taken in connection with theaccompanying drawing, it is thought the complete construction, operationand advantages of my invention, will be clear to those skilled in theart to which it relates.

hat I claim is:

1. In an internal combustion engine wherein is provided a crank case, acrank shaft,

a cylinder secured to the crank case, a stationary piston secured withinthe cylinder, and a reciprocating piston in the cylinder over thestationary piston, said stationary piston having longitudinal slots andsaid reciprocating piston having a cross pin pass ing through saidslots; the combination with the stationary piston, of a crossheadadapted to reciprocate within the stationary piston and connected tosaid cross pin, said cross head having provision continuously to cut offcommunication between the slotted portion of said stationary piston andthe crank case, and a connecting rod between the crank shaft and crosshead.

2. In an internal combustion engine wherein is provided a crank case, acrank shaft, a cylinder secured to the crank case, a stationary pistonsecured within the cylinder, and a reciprocating piston in the cylinderover the stationary piston, said stationary piston having longitudinalslots and said reciprocating piston having a cross pin passing throughsaid slots; the combination with the stationary piston, of a cross headadapted to reciprocate within the stationary piston and connected tosaid cross pin, said cross head having provision continuously to cut offcommunication between the slotted portion of said stationary piston andthe crank ease, and a connecting rod between the crank shaft and crosshead, said cross head comprising bearing slides, a partition shell, across pin bearing and a connecting rod bear ing.

3. In an internal combustion engine wherein is provided a crank case, acrank shaft, a cylinder secured to the crank case, a stationary pistonsecured within the cylinder, and a reciprocating piston in the cylinderover the stationary piston, said stationary piston having longitudinalslots and said reciprocating piston having a cross pin passing throughsaid slots; the combination with the stationary piston, of a cross headadapted to reciprocate within the stationary piston and connected tosaid cross pin, said cross head having provision continuously to cut oilcommunication between the slotted portion of said stationary piston andthe crank case, and a connecting rod between the crank shaft and crosshead, said cross head comprising diametrically opposite bearmg slidesunited by a vertical web having" a cross pin bearing at one end and aconneeting rod bearing at the other end. and a cutoff web intermediatesaid bearings.

4. In an internal combustion engine wherein is provided a crank case, acrank shaft, a cylinder secured to the crank case, a stationary pistonsecured within the cvlinder, and a reciprocating piston in the cylinderover the stationary piston. said sta tionary piston having longitudinalslots and said reciprocating piston having a cross pin passing throughsaid slots; the combination with the stationary piston, of a cross headadapted to reciprocate within the stationary piston and connected tosaid cross pin, said cross head having provision to cut oilcommunication between the slotted portion bearing.

LEONARD V. HOSFORD.

